Same process as this..only using newspaper instead..newspaper will hold the moisture on the tint causing the film to expand...but this method is very similar, and almost labor free.
Step 1 Old tint can be removed with common household items, including black trash bags, ammonia, steel wool and a razor blade or knife.
Step 2 Spray the window's exterior with soapy water, cover it with a black trash bag, smooth the plastic flat, then trim the bag to fit the glass. This will absorb heat, which makes the film expand so that both layers will peel off together.
Step 3 Inside, protect any close-by upholstered surfaces, then spray the window film with undiluted ammonia. Make sure to spray all the way to the edge.
Step 4 Trap the ammonia against the tint with another trash bag or, for small windows, plastic wrap. Then let the window bake in the sun for about an hour to soften the tint's adhesive.
Step 5 Lift a corner of the film with a fingernail or, failing that, a razor blade. Be careful not to nick the defroster lines. The film should peel off in whole pieces; keep the tint moist with ammonia as you strip. Use a razor blade to scrape off any tint that didn't peel.
Step 6 Remove glue residue with ammonia and 0000 (Super Fine) steel wool, wiping with paper towel as you go before the ammonia dries. Finish by removing the exterior trash bag and cleaning both sides of the window with glass cleaner.